package com.ruoyi.blog.common.interceptor;


import com.ruoyi.blog.common.annotation.Login;
import com.ruoyi.common.utils.JwtUtil;
import com.ruoyi.easywenku.entity.User;
import com.ruoyi.easywenku.service.UserService;
import org.apache.shiro.authz.UnauthorizedException;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.MethodParameter;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.lang.reflect.Method;

@Component
public class AuthenticationInterceptor implements HandlerInterceptor {
    public static final String USER_KEY = "userId";

    @Autowired
    UserService userService;

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response,
                             Object object) throws Exception {
        String token = request.getHeader("token");// 从 http 请求头中取出

        // token
        // 如果不是映射到方法直接通过
        if (!(object instanceof HandlerMethod)) {
            return true;
        }
        HandlerMethod handlerMethod = (HandlerMethod) object;
        Method method = handlerMethod.getMethod();
        // 检查是否有passtoken注释，有则跳过认证
         if (!method.isAnnotationPresent(Login.class)) {
             request.setAttribute(USER_KEY, 0);


             if(request.getCookies()==null){
                 return true;
             }
             // 执行认证
             for (Cookie cookie : request.getCookies()) {
                 if ("token".equals(cookie.getName())) {
                     token = cookie.getValue();
                     break;
                 }
             }
             if (token == null) {
                 return true;
             }
             String userId = JwtUtil.getUsername(token);
             if (userId == null) {
                 return true;
             }
             // 验证 token
             if (!JwtUtil.verify(token, userId)) {
                 return true;
             }
             User appUser = userService.getById(userId);
             if (appUser == null) {
                 return true;
             }
             // 设置userId到request里，后续根据userId，获取用户信息
             request.setAttribute(USER_KEY, userId);

        } else {
             // 执行认证
             if (token == null) {
                 throw new RuntimeException("无token，请重新登录");
             }
             String userId = JwtUtil.getUsername(token);
             if (userId == null) {
                 throw new RuntimeException("token invalid");
             }
             // 验证 token
             if (!JwtUtil.verify(token, userId)) {
                 throw new UnauthorizedException();
             }
             User appUser = userService.getById(userId);
             if (appUser == null) {
                 throw new RuntimeException("用户不存在，请重新登录");
             }
             // 设置userId到request里，后续根据userId，获取用户信息
             request.setAttribute(USER_KEY, userId);
        }

        return true;
    }

    @Override
    public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o,
                           ModelAndView modelAndView) throws Exception {
    }

    @Override
    public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse,
                                Object o, Exception e) throws Exception {
    }
}
